Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Monitor Status
The Monitor Status (mode 6) allows the OBD scan tool to display the monitor result, test value and test limit (malfunction criterion). A problem in the EVAP system can be found by comparing the test value and test limit. This procedure is described in "CHECKING MONITOR STATUS" (see CHECKING MONITOR STATUS ).
- TID (Test Identification Data) is assigned to each emission-related component.
- TLT (Test Limit Type):
If TLT is 0, the component is malfunctioning when the test value is higher than the test limit.
If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
- CID (Component Identification Data) is assigned to each test value.
- Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.
TID $02: EVAP - LEVII Vacuum Monitor
| TLT | CID | Unit Conversion | Description of Test Value | Description of Test Limit |
|---|---|---|---|---|
| 1 | $01 | Multiply by 0.183 (mmHg) | Test value of EVAP VSV stuck closed: Determined by fuel tank pressure change during vacuum introduction | Malfunction criterion |
| 0 | $02 | Multiply by 0.0655 (Seconds) | Test value of EVAP VSV stuck open: Determined by abnormal state continuation time | Malfunction criterion |
| 0 | $03 | Multiply by 0.0655 (Seconds) | Test value of canister closed valve (CCV): Determined by abnormal state continuation time | Malfunction criterion |
| 0 | $04 | Multiply by 0.0458 (mmHg) | Test value of 0.04 inch leak: Determined by fuel tank pressure change | Malfunction criterion |
| 0 | $05 | Multiply by 0.0458 (mmHg) | Test value of 0.02 inch leak: Determined by fuel tank pressure change | Malfunction criterion |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.